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- Beinecke Rare Book and Manuscript Library✖[remove]127
- Ecologists--United States21
- Marine biologists--United States21
- DDT (Insecticide)--Environmental aspects20
- Air--Pollution--United States19
- Aquatic biologists--United States19
- Birds--Conservation--United States19
- Conservation of natural resources--United States19
- Conservation of natural resources --United States3
- Pesticides3
- Pollution --Environmental aspects3